Patent GB-493096-A (GB)
Title: Improvements in or relating to knot-tying devices
IPC: B65H69/04
Filed: 1938-01-22
Abstract: 493,096. Knot-tying devices. MELLOR, BROMLEY, & CO., Ltd. (Ramsey, E. L.) Jan. 22, 1938, No. 2173. [Class 112] In a knotting device comprising thread guides, means for crossing the threads, a tying bill, means for cutting the threads at one side of the knot and means for stripping the knot from the tying bill, the movable stripper has a laterally-extending portion with an upwardly-projecting prong adapted to engage the threads close to the knot to pull the knot tight. The frame of the device shown, for the production of a weaver's knot, comprises cranked side plates 20, 21, having horns 50, connected and spaced by a screw 23, pivot bolts 22, 55, 78, 111, an end plate 85, and a #- shaped spacing member 77 having tongues engaging slots in the side plates. A U-shaped bracket 46 fixed to the plate 20 has a thread-cutting blade 100 and a finger 52 which stands between the horn 50 and the main part of the plate 20 ; a co-operating blade 101 is pivoted to the part 46. A thread-positioning finger 57 extending across the working parts is carried by a member 56 pivoted at 55, with a biassing spring, to the horn 50 of the plate 20. Pivoted to the plates 20, 21 at 42, 64, Fig. 11, are notched threadengaging members 41, 63, actuated respectively by members 37, 38, also provided with threadengaging notches, which slide in slots 47 in the cranked parts of the plates 20, 21 and are connected by a pin 36 sliding in slots 35 in the side-plates ; these members 37, 38 are pivotally connected to the lower parts of the members 41, 63. The member 38 has a lateral lug carrying a thread-engaging hook 61, and the member 63 has a finger 65 with a notch at each side of its base. The tying bill 86 is carried by a flat twisted shaft 82 mounted in bearings in the members 77, 85, and has pivoted to it at 95 a cutting and gripping bill 87 having a broad tail 96 which engages a cam aperture 97 in the member 77 ; a spring member presses the bills 87, 86 together. The stripper 113, pivoted at 111, extends downwards at one side of the tying bill and has a pronged end extending beneath the bill and projecting upwardly at the other side. The parts are actuated by a finger-lever 26, pivoted at 22 and formed with an upper part 27 having a tail 28 and a lateral lug 33 with an upward extension 34 ; a return spring engaging the lug 33 is mounted on the pivot 22. A notch in the cam-surface of the lever engages the pin 36 to actuate the threadmanipulating members 37, 38, the lug extension 34 bears against one side of the member 82 to rotate the latter as the part 34 is moved along it, the tail 28 holds the stripper depressed by moving along a tail 112 of the latter and finally operates it by engaging a lug 116 on it, and a pin 109 on the lever similarly holds and later actuates a member 105 which is pivoted at 78 and actuates the blade 101 through a pin-andslot connection. In operation, the threads are laid on either side of the bill 86 and fingers 52, 65 as shown in Fig. 11 ; the first movement of the lever 26 actuates the members 37, 38 to move the inner thread A forward over the members 41, 63 while the latter members carry the outer thread B backwards and downwards so that the threads are crossed at each side of the bill ; the threads are also held between the members 37, 38, which are resilient, and 41, 63. The tying bill is then rotated anticlockwise, engaging over the crossed threads and forming loops in them. During the latter part of its rotation, the cam-aperture 97 causes the bill 87 to open and then to close upon the thread B, cutting it and holding the end ; at the same time the blade 101 is operated to cut the thread A. At the completion of the rotation of the tying bill, the stripper is operated, its outer prong rising between the threads so that the thread B lies between the prongs and both threads are pulled to draw their loops off the tying bill over the end of thread B, which remains held, as shown in Fig. 15, until the knot is drawn tight.